CN206497975U - A kind of directional coupler - Google Patents
A kind of directional coupler Download PDFInfo
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- CN206497975U CN206497975U CN201720089152.2U CN201720089152U CN206497975U CN 206497975 U CN206497975 U CN 206497975U CN 201720089152 U CN201720089152 U CN 201720089152U CN 206497975 U CN206497975 U CN 206497975U
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Abstract
The utility model is related to a kind of directional coupler, including main transmission line, the first secondary transmission line, the first amplitude equalization network and the first isolation network, and two ports of the main transmission line are respectively the input port of the directional coupler, straightthrough port；Main transmission line and the first secondary transmission line coupling constitute the first coupled microstrip line；One end of the first amplitude equalization network is connected with the coupled end of the first coupled microstrip line, and the other end is connected with the coupled end of the directional coupler；First isolation network includes an adjustable resistance and an electric capacity, and one end is connected with the isolation end of the first coupled microstrip line after the adjustable resistance is in parallel with electric capacity, other end ground connection.The working band of above-mentioned directional coupler is wide, size is small, manufacturing process is simple, production cost is low.
Description
Technical field
The utility model is related to radio circuit design field, more particularly to a kind of directional coupler.
Background technology
Directional coupler is wide variety of a kind of radio-frequency devices in radio system, and its essence is by one by radiofrequency signal
Fixed ratio carries out power distribution, the radiofrequency signal transmitted in main transmission line is coupled out into a part, for power detection.Orientation
Coupler is generally four port networks, and first port is that input port, second port are straightthrough port, first port and second port it
Between transmission line be main transmission line；Another transmission line is adjacent with first port in secondary transmission line (i.e. coupling line), secondary transmission line
Port be coupled end, other a port is then isolation end.
The technical indicator of directional coupler mainly has the degree of coupling, bandwidth of operation, insertion loss, the flatness of the degree of coupling and side
Tropism.Prior art is by the way of the transmission line coupler of λ/4, it is necessary to could realize that broadband is used using multistage cascade,
VHF/UHF frequency ranges add that exponent number is more in use, operation wavelength is longer, and Insertion Loss is larger with size.
Utility model content
Based on this, it is necessary in view of the above-mentioned problems, providing a kind of directional coupler, be not required to use multi-stage cascade, you can real
Existing broadband is used, and Insertion Loss and size are small.
A kind of directional coupler, including main transmission line, the first secondary transmission line, the first amplitude equalization network and the first separation net
Network, two ports of the main transmission line are respectively the input port of the directional coupler, straightthrough port；Also include the first coupling micro-
Band line, first coupled microstrip line is that main transmission line and the first secondary transmission line coupling are constituted；The first amplitude equalization network
One end be connected with the coupled end of the first coupled microstrip line, the other end be the directional coupler the first coupled end；Described
One isolation network includes an adjustable resistance and an electric capacity, and one end couples micro- with first after the adjustable resistance is in parallel with electric capacity
Isolation end with line is connected, other end ground connection.
Above-mentioned directional coupler, using coupled microstrip line and amplitude equalization real-time performance, coupled microstrip line and amplitude equalization
Simple in construction, the significantly size of diminution coupler, and do not need multi-stage cascade to be that wideband work, interpolation can be achieved of network
All it is greatly improved with the parameter such as flatness
Brief description of the drawings
Fig. 1 is a kind of directional coupler described in the utility model.
Embodiment
Further to illustrate the effect of technological means that the utility model taken and acquirement, below in conjunction with the accompanying drawings and compared with
Good embodiment, to the technical scheme of the utility model embodiment, carries out clear and complete description.
Such as Fig. 1, a kind of directional coupler, including main transmission line 7, the first secondary transmission line, the first amplitude equalization network 1 and the
One isolation network 2, two ports of the main transmission line 7 are respectively the input port of the directional coupler (i.e. in Fig. 1
Port1), straightthrough port (i.e. Port2 in Fig. 1).The secondary transmission line coupling of main transmission line 7 and first constitutes the first coupled microstrip line 5,
One end of the first amplitude equalization network 1 is connected with the coupled end of the first coupled microstrip line 5, and the other end is the directional couple
The first coupled end (i.e. Port3 in Fig. 1) of device.Described one end of first isolation network 2 and the isolation end of the first coupled microstrip line 5
It is connected, other end ground connection；The first described isolation network 2, comprising adjustable resistor R2 and capacitor C3 connected in parallel, wherein
R2 and C3 input port is connected with the isolation end of the first coupled microstrip line 5, and R2 and the C3 other end are grounded.
Above-mentioned directional coupler, using coupled microstrip line and amplitude equalization real-time performance, without multi-stage cascade, you can real
Existing wideband work, and on parameters, relative to traditional directional coupler, interpolation and flatness to greatly carrying
Rise, while by matched resistor R2 and capacitor C3 size, directionality is also greatly improved.
In one embodiment, the first described amplitude equalization network is with every octave decay 5dB-10dB transmission characteristics
Equalising network, in amplitude equalization network 1, capacitor C2 (i.e. the second capacitor) and inductor L2 (i.e. the second inductor) structure
Into series resonant tank, at the frequency away from resonance center, transfer curve is presented to be increased close to by per octave attenuation
Plus 5dB-10dB rule change.
In one embodiment, the first described amplitude equalization network 1 specifically includes resistor R1 (i.e. first resistor device), electricity
Container C1 (i.e. the first capacitor), C2, and inductor L1 (i.e. the first inductor), wherein L2, L1 input and the first coupling
The coupled end for closing microstrip line 5 is connected, and L1 output end is connected with R1 and C1 input, R1 output end and the directional couple
First coupled end of device is connected, and C1 other end ground connection, L2 input is connected with the coupled end of the first coupled microstrip line 5, L2
Output end be connected with C2 input, C2 output end is connected with the first coupled end of the directional coupler.
Directional coupler in above-described embodiment, L1, C1 and R1 are applied not only to adjust the first of positive single directional coupler
The impedance matching of coupled end, and by adjusting inductor L1 and capacitor C2 size, thus it is possible to vary directional coupler is most
Low working frequency.
In one embodiment, described directional coupler, in addition to amplitude the second equalising network 3, the second isolation network 4,
The the second secondary transmission line coupled with main transmission line 7, the secondary transmission line of main transmission line 7 and second constitutes the second coupled microstrip line 6, wherein
One end of second amplitude equalization network 3 is connected with the coupled end of the second coupled microstrip line 6, the other end and the directional coupler
Second coupled end (be Port4 in figure) is connected, described the second isolation network 4 specifically comprising adjustable resistor R4 and and its
Capacitor C6, wherein R4 and C6 in parallel input port is connected with the isolation end of the second coupled microstrip line 6, R4 and the C6 other end
It is grounded.The described secondary transmission line of first amplitude equalization network 1, first, the first isolation network 2 and the second amplitude equalization network 3,
Second secondary transmission line, the second isolation network 4 are symmetrically arranged amongst the both sides of the vertical line of main transmission line in minute surface.
The directional coupler of above-described embodiment, when antenna opening impedance mismatching produces reflection, the orientation described in the present embodiment
Coupler can realize that oriented opposite works, and whole directional coupler can realize that amphiorentation works.
In one embodiment, the second described amplitude equalization network is with every octave decay 5dB-10dB transmission characteristics
Equalising network, in amplitude equalization network 2, capacitor C5 (i.e. the 4th capacitor) and inductor L4 (i.e. the 4th inductor) structure
Into series resonant tank, at the frequency away from resonance center, transfer curve is presented to be increased close to by per octave attenuation
Plus 5dB-10dB rule change.
In one embodiment, the second described amplitude equalization network 3, can specifically include resistor R3 (i.e. second resistances
Device), capacitor C4 (i.e. the 3rd capacitor), C5 (i.e. the 4th capacitor), and inductor L3 (the 3rd inductor), L4 the (the 4th
Inductor), wherein L3 input is connected with the coupled end of the second coupled microstrip line 6, L3 output end and R3 and C4 input
End is connected, and R3 output end is connected with the second coupled end of the directional coupler, and the C4 other end is grounded, L4 input and
The coupled end of second coupled microstrip line 6 is connected, and L4 output end is connected with C5 input, C5 output end and the orientation coupling
Second coupled end of clutch is connected.
Directional coupler in above-described embodiment, L3, C4 and R3 are applied not only to adjust the second of positive single directional coupler
The impedance matching of coupled end, and by adjusting inductor L3 and capacitor C4 size, thus it is possible to vary directional coupler is most
Low working frequency.
Further, a kind of specific example of directional coupler is shown below is, it is specific as follows：
Wherein, the Ω of the Ω of resistor R1 values 50, adjustable resistor R2 value 58, capacitor C1 values 82pF, C2 value
1000pF, C3 value 2.2pF, inductor L1 values 12nH, L2 value 150nH, in 108MHz~512MHz working frequency range scopes
Interior, the directional coupler degree of coupling is 50dB, and flatness is not more than ± 0.2dB, and directionality is more than 21dB, dual directional coupler it is whole
Body physical dimension is only 48mm × 20mm × 3mm.
Such as Fig. 1, it is assumed that it is forward direction that signal, which inputs the direction transmitted to Port2 from Port1, signal from Port2 input to
The direction of Port1 transmission is reverse.For positive single directional coupler, Port1 is input port, and Port2 is straightthrough port,
Port3 is coupled end.
In actual use, Port1 is connected with the radio frequency delivery outlet of high-power broadband linear radio-frequency power amplifier, Port2 and day
The rf input port connection of line.The sampling mechanism of positive list directional coupler is as follows：The high-power RF exported when RF power amplification
Signal from Port1 input along micro-strip main transmission line to Port2 transmit when, micro-strip pair transmission line by coupling gap from micro-strip master
Transmission line coupling goes out a part of signal energy and delivers to the first amplitude equalization network 1, when the length of coupled zone is less than operation wavelength
When 1/10th, its amplitude-versus-frequency curve of the signal for being coupled out changes the rule for increasing 6dB by every octave.
For the first amplitude equalization network 1, pass through reasonable disposition inductor L1 and L2 inductance value, resistor R1 resistance
Value, capacitor C1 and C2 capacitance, can make the transfer curve of equalising network increases 6dB's by every octave attenuation
Rule changes, and wherein L2 and C2 constitute series resonant tank, at the frequency away from resonance center, and transfer curve is presented and connect
The nearly rule change pressed per octave attenuation increase 6dB, inductor L1 and capacitor C2 are mainly used in adjusting positive single orientation
The lowest operating frequency of coupler, inductance value increase or capacitance reduce, and lowest operating frequency will be decreased.L1, C1 and R1
For the impedance matching for the coupled end Port3 for adjusting positive single directional coupler, while the coupling to positive single directional coupler
Flatness is finely adjusted.The one end of first isolation network 1 connects isolation end, can be made just by adjusting R2 resistance and C3 capacitance
Preferable directionality is obtained to single directional coupler.
For reverse single directional coupler, Port2 is input port, and Port1 is straightthrough port, and Port4 is coupled end, every
It is connected from end with the second isolation network 4, when antenna opening produces reflection due to impedance mismatching, reflected signal inputs edge from Port2
Micro-strip main transmission line to transmit to Port1.Inductor L4 and capacitor C5 are mainly used in adjusting reverse single directional coupler most
Low working frequency, inductance value increase or capacitance reduce, and lowest operating frequency will be decreased；L3, C4 and R3 are used to adjust anti-
To the coupled end Port4 of single directional coupler impedance matching, while being carried out to the Coupling flatness of reverse single directional coupler
Fine setting, the reversely preferable directionality of single directional coupler acquisition can be made by adjusting R4 resistance and C6 capacitance.Wherein resistor
R1 is identical with R3 resistance value, and adjustable resistor R2 is identical with R4 resistance value, capacitor C1 is identical with C4 capacitance, C2 and
C5 capacitance is identical, and C3 is identical with C6 capacitance, and inductor L1 is identical with L3 inductance value, L2 and L4 inductance value phase
Together, reversely the index such as single directional coupler and the degree of coupling, isolation of positive list directional coupler is identical.
Positive list directional coupler and reverse single directional coupler constitute dual directional coupler after being directly connected to, can be simultaneously
Forward signal and reverse signal are sampled.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the present utility model, and it describes more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent scope.It should be pointed out that for the common skill of this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
Protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (6)
1. a kind of directional coupler, it is characterised in that including main transmission line, the first secondary transmission line, the first amplitude equalization network and
First isolation network；
Two ports of the main transmission line are respectively the input port of the directional coupler, straightthrough port；Main transmission line and first
Secondary transmission line coupling constitutes the first coupled microstrip line；One end of the first amplitude equalization network and the coupling of the first coupled microstrip line
Close end to be connected, the other end is connected with the first coupled end of the directional coupler；First isolation network is adjustable including one
Resistance and an electric capacity, the adjustable resistance are in parallel with electric capacity, one end and the first coupled microstrip line of first isolation network
Isolation end be connected, the other end ground connection.
2. directional coupler according to claim 1, it is characterised in that the first described amplitude equalization network is with every
The equalising network of octave decay 5dB-10dB transmission characteristics.
3. directional coupler according to claim 2, it is characterised in that the first described amplitude equalization network, includes
One resistor, the first capacitor, the second capacitor, the first inductor and the second inductor；
Wherein the input of the first inductor is connected with the coupled end of the first coupled microstrip line, the output end of the first inductor and the
The input of the input of one resistor and the first capacitor is connected, the output end of first resistor device and the directional coupler
Coupled end is connected, the other end ground connection of the first capacitor, the coupled end of the input of the second inductor and the first coupled microstrip line
It is connected, the output end of the second inductor is connected with the input of the second capacitor, the output end of the second capacitor and the orientation
First coupled end of coupler is connected.
4. directional coupler according to claim 1, it is characterised in that also equal including the second secondary transmission line, the second amplitude
Weigh network and the second isolation network；Main transmission line and the second secondary transmission line coupling constitute the second coupled microstrip line；Second width
One end of degree equalising network is connected with the coupled end of the second coupled microstrip line, and the other end is coupled with the second of the directional coupler
End is connected；Second isolation network, comprising an adjustable resistor and a capacitor, adjustable resistor and capacitor are simultaneously
Connection, described second isolation network one end is connected with the isolation end of the second coupled microstrip line, and the other end is grounded；
The secondary transmission line of described first, the first amplitude equalization network, the first isolation network and the second secondary transmission line, the second amplitude are equal
Weighing apparatus network, the second isolation network are symmetrically arranged amongst the both sides of the vertical line of main transmission line in minute surface.
5. directional coupler according to claim 4, it is characterised in that the second described amplitude equalization network is with every
The equalising network of octave decay 5dB-10dB transmission characteristics.
6. directional coupler according to claim 5, it is characterised in that the second described amplitude equalization network, includes
Three resistors, the 4th capacitor, the 5th capacitor, the 3rd inductor and the 4th inductor；
The input of wherein the 3rd inductor is connected with the coupled end of the second coupled microstrip line, the output end of the 3rd inductor and the
The input of the input of three resistors and the 4th capacitor is connected, the output end of 3rd resistor device and the directional coupler
Coupled end is connected, the other end ground connection of the 4th capacitor, the input of the 4th inductor and the coupled end of the second coupled microstrip line
It is connected, the output end of the 4th inductor is connected with the input of the 5th capacitor, the output end of the 5th capacitor and the orientation
Second coupled end of coupler is connected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720089152.2U CN206497975U (en) | 2017-01-20 | 2017-01-20 | A kind of directional coupler |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720089152.2U CN206497975U (en) | 2017-01-20 | 2017-01-20 | A kind of directional coupler |
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| CN206497975U true CN206497975U (en) | 2017-09-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111708056A (en) * | 2020-06-23 | 2020-09-25 | 维沃移动通信有限公司 | Signal processing method, signal processing device and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111708056A (en) * | 2020-06-23 | 2020-09-25 | 维沃移动通信有限公司 | Signal processing method, signal processing device and electronic equipment |
| CN111708056B (en) * | 2020-06-23 | 2024-02-02 | 维沃移动通信有限公司 | Signal processing method, processing device and electronic equipment |
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